An investigation is underway following a fatal crash on the Augusta Highway this morning.
Emergency services were called to the scene just before 4.30am this morning, to an area roughly 15km south of Port Augusta in Winninowie.
This came with reports that a car had left the road and collided with a parked trailer.
The 20-year-old driver and his 30-year-old passenger both died at the scene.
Major Crash investigators are currently examining the circumstances of the collision.